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AP EAMCET202316 May 2023Morning ShiftChemistryp Block Elements (Group 13 & 14)Actual

Which of the following statements are not correct? i. Atomic radius of Ga is less than that of Al ii. The order of ionization enthalpy of group 13 elements is B > Al > Ga > In > Tl iii. Boron trioxide is amphoteric in nature

Options

  1. Aii, iii only
  2. Bi, iii only
  3. Ci, ii only
  4. Di, ii, iii

Correct answer

A. ii, iii only

Step-by-step solution

The order of atomic radii of group 13 elements varies as:- B Tl > Ga > Al > In This is due to poor shielding by d-subshells and f -subshells that result in ionization enthalpy being higher for Tl and Ga . Thus, statement (ii) is incorrect. Boron trioxide B ₂ O ₃ is acidic in nature as it is a nonmetal oxide and dissolves in water to form H ₃ BO ₃ . Thus, statement (iii) is incorrect.

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